2013120661 has 16 divisors (see below), whose sum is σ = 2139897600. Its totient is φ = 1888524288.

The previous prime is 2013120653. The next prime is 2013120689. The reversal of 2013120661 is 1660213102.

It is a cyclic number.

It is not a de Polignac number, because 2013120661 - 2³ = 2013120653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013120601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 875265 + ... + 877561.

It is an arithmetic number, because the mean of its divisors is an integer number (133743600).

Almost surely, 2^2013120661 is an apocalyptic number.

It is an amenable number.

2013120661 is a deficient number, since it is larger than the sum of its proper divisors (126776939).

2013120661 is a wasteful number, since it uses less digits than its factorization.

2013120661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2013120661 is about 44867.8131960986. The cubic root of 2013120661 is about 1262.6702129881.

Adding to 2013120661 its reverse (1660213102), we get a palindrome (3673333763).

The spelling of 2013120661 in words is "two billion, thirteen million, one hundred twenty thousand, six hundred sixty-one".